JP2019000846A - Device and method for generating impact pulse or vibration for construction machine - Google Patents

Abstract

To provide a device and a method for generating impact pulse or vibration capable of more flexibly setting and changing impact or vibration motion.SOLUTION: A device and a method for generating impact pulse or vibration for a construction machine is provided. In a movement space of a housing, inverted reciprocation of a piston is performed between a first inversion point and a second inversion point. It is set that the piston performs the inverted reciprocation in order to generate impact pulse or vibration by pressure fluid supplied and discharged with respect to the movement space in regions of the first inversion point and the second inversion point. According to the device and the method for generating impact pulse or vibration, a position of the piston is measured by measuring means, a control unit controls at least one controllable valve for supplying and/or discharging pressure fluid with respect to the movement space in accordance with a measured position of the piston, and movement of the piston is controlled by the control unit.SELECTED DRAWING: Figure 1

Description

  According to a first aspect of the present invention, there is provided a housing, a piston capable of reciprocating reciprocating between a first reversing point and a second reversing point in an operation space in the housing, a first reversing point and a second reversing point. In the region of the reversal point, it has a pressure fluid supply section that can supply and discharge the pressure fluid to and from the working space, and can be set so that the piston reciprocates in reverse to generate shock pulses or vibrations The invention relates to a device for generating shock pulses or vibrations for construction machinery.

  According to a tenth aspect of the present invention, there is provided the region of the first inversion point and the second inversion point by reciprocally moving the piston between the first inversion point and the second inversion point in the operation space in the housing. A method for generating a shock pulse or vibration for a construction machine, wherein the pressure fluid supplied to and discharged from the working space is set such that a piston is reciprocally moved back and forth to generate the shock pulse or vibration. .

  Patent Document 1 discloses a known general vibration generator. In this known vibration generator, the operating space in the housing is divided into two pressure chambers by the operating piston. As the pressure fluid is selectively supplied and discharged alternately through the inlets and outlets of the two pressure chambers, the operating piston repeatedly moves and vibrations are generated. Timed supply / discharge of pressure fluid to each pressure chamber is achieved by ducts arranged in a complex manner in the working piston. In addition, a control piston is movably supported in the working piston. The position of the control piston relative to the working piston can be selectively changed by a plug member that projects from the front of the housing to open / close a given duct. Therefore, supply / discharge of the pressure fluid is realized by mechanical means. That is, pressure fluid supply / discharge switching is performed through a given duct when a given switching point is reached.

  Patent Documents 2 to 4 disclose examples of mechanical control means in a similar vibration generator. In all these known devices, an operating piston and a control piston are provided, and a given duct is opened or closed depending on the position in the respective housing. Thereby, selective alternate supply to the two pressure chambers provided on the opposite sides is executed, and the operating piston moves.

EP1728564B1 publication GB920,158A publication US Pat. No. 4,026,193A US Pat. No. 4,031,812A

  Such devices are time consuming and expensive to manufacture. Furthermore, the arrangement of the ducts pre-limits a given vibration or impact movement of the piston to a predetermined pressure level. Therefore, the range of change in vibration frequency and impact energy is very limited, and in some cases, extensive mechanical reconfiguration is required for the change.

  It is an object of the present invention to provide an apparatus and method for generating shock pulses or vibrations that can more flexibly realize setting and changing of shock or vibration movements.

  One of the objects is achieved by a device having the features of claim 1 and the other is achieved by a method having the features of claim 10. Preferred embodiments of the invention are described in the dependent claims.

  In the device according to the invention, measuring means are provided for determining the position of the piston in the working space, at least one controllable valve is arranged to supply and / or discharge pressure fluid to the working space, A control unit is provided that is connected to the means and to the at least one controllable valve so as to control and change the movement of the piston in the working space.

  The basic idea of the present invention is to abandon previous complicated mechanical control over the piston in the operating space and to realize control by an electric or electronic control unit. According to the invention, at least one measuring means is provided for determining the position of the piston in the operating space. The measuring means can transmit a signal relating to the position data of the piston continuously or at predetermined short time intervals. The signal is received by the control unit and processed as a function of predetermined control logic. Thus, control signals or control data are generated for one or several controllable valves. Thus, at least one controllable valve can selectively supply and discharge pressure fluid to the working space.

  Therefore, according to the device of the present invention, an elaborately crafted operating piston that is provided with a plurality of lines is unnecessary. Therefore, the manufacturing cost is greatly reduced. Furthermore, by changing or applying the corresponding control logic of the control unit, the movement of the piston in the housing can be controlled and changed particularly easily. Therefore, the stroke and / or frequency of the repetitive movement of the piston can be controlled and changed relatively easily.

  Essentially any suitable controllable valve can be used in the device of the invention. According to a further aspect of the invention, the valve is preferably a solenoid valve. The valve body can be adjusted by an electromagnetic arrangement between the open position and the closed position. An intermediate position can also be set. Thereby, the amount of the pressure fluid supplied to the operation space can also be adjusted. Basically, any pressure fluid may be provided, but hydraulic oil is preferably used.

  Similarly, the measuring means can be realized by any sensor that can be used for length or position measurement, operating in particular in a manner such as optical, capacitive, inductive, magnetic, etc. According to an embodiment of the invention, it is particularly advantageous that the measuring means comprises a linear sensor. This configuration is particularly preferable when the piston moves linearly between two inversion points in the housing.

  A preferred embodiment aspect of the invention is realized by the measuring means having an elongated first measuring member extending in the working space and in the free space of the piston. That is, the measuring member is not disposed behind the wall of the housing, but is directly disposed in the operation space in which the piston moves. A particularly accurate position measurement can be realized by the elongated first measuring member projecting into the corresponding free space of the piston. In this configuration, the piston preferably moves along the first measurement member, with the second measurement member integral with the piston being in non-contact with the first measurement member.

  It is particularly preferred that a second measuring member such as a magnet is arranged in the free space of the piston. The two measuring members interact in a non-contact manner so that the position of the second measuring member, and hence the piston, can be determined with high accuracy relative to the first measuring member and thus to the operating space of the housing. The first measurement member may have a coil. The position of the piston is measured by the magnet inducing a current of 4 to 20 mA into the coil.

  Basically, the piston can be moved repeatedly within the housing such that its two end faces do not contact the wall of the housing. In this way, the device can be used as a so-called vibration generator. An advantageous embodiment of the invention is realized in that at least one reversal point is provided with a collision surface on which the piston collides, in particular to generate a shock pulse. Basically, the impact surface can be arranged in the housing with respect to the opposite end surfaces of the piston. However, it is preferable that only a single collision surface exists so that a specific shock pulse can be generated as desired, for example, in the shock drilling.

  According to a further aspect of the invention, it is preferred that the frequency and / or stroke of the piston can be set and adjusted by the control unit. The control unit can change the frequency in particular by setting the opening / closing timing and the hydraulic energy supply as required. Furthermore, the stroke of the piston can be realized by changing the position of the two reversal points by opening and closing the corresponding controllable valve. For this, the control unit preferably has an input interface such as an input field. Furthermore, the control unit can be actuated directly by general machine control via an operator operating unit.

  In another preferred embodiment aspect of the invention, the control unit comprises a program memory in which a plurality of different control programs for controlling the piston can be stored. For example, a specific control program can be stored in accordance with a specific application. For example, at the start of the program, the frequency may be high due to the small piston stroke, and then the piston stroke may increase with the passage of time in the program sequence, and the frequency may be reduced. Any number of different program sequences may be provided to control the piston with respect to frequency and stroke. For example, a program for rapid advance or special slow drive processing may be provided. Furthermore, you may memorize | store the program with respect to a specific kind of soil.

  The present invention includes a construction machine provided with the above-described device for generating shock pulses or vibrations. In particular, the construction machine may be provided for the foundation method.

  According to an embodiment of the present invention, it is particularly preferred that the construction machine is a ground drill device. If a device for generating shock pulses is provided, impact drilling can be performed. This is particularly advantageous when penetrating through hard rock formations. Additionally / or the device may generate vibrations without impact contact. If it is an apparatus for earth drills having an excavator that is driven to rotate, so-called overburden excavation can be carried out. Here, the vibration motion is added to the rotational motion of the excavator. By applying vibration, so-called ground liquefaction occurs at least in a region where the excavator contacts, and excavation processing is facilitated.

  Another embodiment of the present invention is realized when the construction machine is a pile driver or a vibrator. The pile driver or vibrator can be used to feed steel girders, piles, and sheet piles that are driven into the ground by impact pulses or vibration, for example.

  According to the method of the present invention, the position of the piston is detected by the measuring means, and according to the detected position of the piston, the control unit has at least one control for supplying and / or discharging pressure fluid to the working space. This is realized by controlling the enabling valve and controlling the movement of the piston by the control unit.

  Specifically, the method of the present invention can be performed with the above-described apparatus. Therefore, the above-described advantages can be obtained by this method.

It is a figure which shows the apparatus which produces | generates the shock pulse which concerns on embodiment of this invention.

  The invention is further described below on the basis of preferred embodiments schematically illustrated in the accompanying drawings.

  The drawing is one and shows an apparatus 10 according to an embodiment of the present invention designed to generate shock pulses. The apparatus 10 includes a housing 12 having a cylindrical operating space 14. Within the space, the substantially cylindrical piston 20 is supported so as to be linearly movable so as to be reversible between two reversal points. The piston 20 is liquid-tightly supported in the housing 12, and one side can protrude from the housing 12 as shown in the embodiment. The piston 20 can collide with the corresponding collision surface 18 by the free end surface 24. The surface 18 may be the insertion side end of the drill drive shaft.

  In the region of the upper first inversion point, the housing 12 is provided with a first opening 15 for the first supply path 31 of the pressure fluid supply unit 30. In the region of the lower second inversion point, the operation space 14 is connected to the second supply path 32 of the pressure fluid supply unit 30 through the second opening 16. In the illustrated embodiment, two openings 15 and 16 are alternately connected to the hydraulic source P and the non-pressurized exhaust tank T by a controllable valve 36 which is designed as a 2/4 directional control valve. With this configuration, the two pressure chambers on the opposite sides of the working space 14 are alternately filled with the pressure fluid, or the pressure fluid is discharged. As a result, the piston 20 is set so as to perform a desired reverse movement in the housing 12. In the present embodiment, the two pressure chambers of the operation space 14 are partitioned by a partition member having a shape such as a piston ring that moves integrally with the piston 20, but may be partitioned by the piston 20 itself.

  According to an embodiment of the present invention, a measuring means 40 having a first elongated measuring member 42 is provided on the housing 12. The first measuring member 42 is designed in the shape of a rod and extends into the working space 14 and the free space 22 arranged correspondingly in the piston 20. In the lower region of the free space 22, a magnet, for example, an annular magnet is arranged as the second measurement member 44. The second measurement member 44 is firmly connected to the movable piston 20, and the elongated first measurement member 42 is firmly attached to the housing 12. The first and second measuring members 42 and 44 of the measuring means 40 interact without contact. The measuring means 40 is designed, for example, as an inductive linear sensor for accurately determining the position of the second measuring member 44 and thus the position of the piston 20 relative to the elongated first measuring member 42, ie the position of the piston 20 in the operating space 14. The In the present embodiment, the first measurement member 42 that passes through the hollow hole of the annular magnet (second measurement member) 44 may include, for example, a coil in which a current is induced by the magnetic field of the annular magnet 44. The position of the piston 20 is measured by the induced current.

  By connecting the measuring means 40 to the control unit 50 via the line connection 52, an analog signal or digital data indicating the current position of the piston 20 in the operating space 14 is transmitted. The controllable valve 36 is operated via the electromagnetic element 37 according to a predetermined program or the control logic of the control unit 50, so that, for example, the first supply path 31 is connected to the non-pressurized tank T as shown in FIG. The second supply path 32 is connected to the pressure source P. When the valve 36 is switched by the control unit 50, the pressure source P is connected to the first supply path 31 and the tank T is connected to the second supply path 32. In such a valve position, the pressure fluid is withdrawn from the lower region of the working space 14 and at the same time the upper region of the working space 14 is filled with the pressure fluid. In this case, the piston 20 moves downward from the upper first inversion point toward the lower second inversion point. When the measuring means 40 recognizes that the piston 20 has reached the trigger point in the housing 12, the control unit 50 switches the valve 36 again and the electromagnetic element 37 of the controllable valve 36 via the control line 54. When the is operated, a change of direction occurs.

  Only by changing the control logic of the corresponding control logic 50, the frequency and stroke of the piston 20 between the two reversal points can be changed and set.

Although the present embodiment has been described in detail as described above, it will be easily understood by those skilled in the art that many modifications can be made without departing from the novel matters and effects of the present invention. Accordingly, all such modifications are intended to be included in the scope of the present invention. For example, a term described at least once together with a different term having a broader meaning or the same meaning in the specification or the drawings can be replaced with the different term in any part of the specification or the drawings. The configuration and operation of the biological information estimation apparatus are not limited to those described in the present embodiment, and various modifications can be made.

DESCRIPTION OF SYMBOLS 14 ... Operation | movement space, 20 ... Piston, 22 ... Free space, 30 ... Pressure fluid supply part, 36 ... Controllable valve, 40 ... Measuring means, 42 ... Rod-shaped 1st measurement member, 44 ... 2nd measurement member (magnet), 50 ... Control unit

Claims (10)

A device for generating shock pulses or vibrations for construction machinery,
A housing,
A piston capable of reciprocating reciprocally between a first reversing point and a second reversing point in an operating space within the housing to generate a shock pulse or vibration;
A pressure fluid supply section capable of supplying and discharging pressure fluid to and from the operating space in the region of the first inversion point and the second inversion point;
Measuring means for measuring the position of the piston in the operating space;
At least one controllable valve for supplying and / or discharging the pressure fluid to and from the working space;
A control unit connected to the measuring means and the at least one controllable valve to control and change the movement of the piston in the operating space;
A magnet fixed in free space in the piston;
Have
The measurement means includes a rod-shaped first measurement member fixed to the housing so as to extend into the operation space and a free space within the piston,
The said piston which has the said magnet which is a 2nd measurement member of the said measurement means is an apparatus with which the said magnet and the said rod-shaped 1st measurement member are non-contact, and move along the said rod-shaped 1st measurement member.   The apparatus of claim 1, wherein the valve is a solenoid valve.   The apparatus according to claim 1, wherein the measuring means is a linear sensor.   The device according to claim 1, wherein a collision surface against which the piston collides is provided at at least one inversion point, in particular for generating a shock pulse.   The device according to claim 1, wherein the frequency and / or stroke of the piston can be set and adjusted by the control unit.   The apparatus according to claim 1, wherein the control unit comprises a program memory in which a plurality of different programs for controlling the piston are stored.   A construction machine provided with a device for generating shock pulses or vibrations according to claim 1.   The construction machine according to claim 7, which is an earth drill device.   The construction machine according to claim 7, which is a pile driver or a vibrator. A method for generating shock pulses or vibrations for construction machinery, in particular with the device according to claim 1, comprising:
Reversing and reciprocating the piston between a first reversing point and a second reversing point in an operating space in the housing;
In the region of the first inversion point and the second inversion point, the piston is set to reciprocate in reverse to generate an impact pulse or vibration by the pressure fluid supplied to and discharged from the operation space. And
Including
The position of the piston is measured by measuring means;
Depending on the measured position of the piston, the control unit controls at least one controllable valve for supplying and / or discharging the pressure fluid to the working space;
The method wherein movement of the piston is controlled by the control unit.

Images